[WIP] Tidy: simplify tuple info

[charlesroddie]

Description

The type TupInfo was uncessary and not documented. It reduces to a bool (representing whether the tuple is a struct), allowing simplification of code. The uses of this bool are now documented as isStruct. A few methods can be simplified or deleted as a result.

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[charlesroddie]

I am doing something tiny in this PR to figure out the process again before doing something interesting.

Currently if I run build.cmd on my system on main I get

C:\Users\charl\source\repos\fsharp\buildtools\buildtools.targets(30,5): error MSB3073: The command ""C:\Program Files\d
otnet\dotnet.exe" "C:\Users\charl\source\repos\fsharp\artifacts\\Bootstrap\fslex\fslex.dll" -o "C:\Users\charl\source\r
epos\fsharp\artifacts\obj\FSharp.Compiler.Service\Debug\netstandard2.0\illex.fs" --module FSharp.Compiler.AbstractIL.As
ciiLexer --internal --open Internal.Utilities.Text.Lexing --open FSharp.Compiler.AbstractIL.AsciiParser --unicode --lex
lib Internal.Utilities.Text.Lexing AbstractIL\illex.fsl" exited with code 1. [C:\Users\charl\source\repos\fsharp\src\Co
mpiler\FSharp.Compiler.Service.fsproj::TargetFramework=netstandard2.0]

[vzarytovskii]

I am doing something tiny in this PR to figure out the process again before doing something interesting.

Currently if I run build.cmd on my system on main I get

C:\Users\charl\source\repos\fsharp\buildtools\buildtools.targets(30,5): error MSB3073: The command ""C:\Program Files\d

otnet\dotnet.exe" "C:\Users\charl\source\repos\fsharp\artifacts\\Bootstrap\fslex\fslex.dll" -o "C:\Users\charl\source\r

epos\fsharp\artifacts\obj\FSharp.Compiler.Service\Debug\netstandard2.0\illex.fs" --module FSharp.Compiler.AbstractIL.As

ciiLexer --internal --open Internal.Utilities.Text.Lexing --open FSharp.Compiler.AbstractIL.AsciiParser --unicode --lex

lib Internal.Utilities.Text.Lexing AbstractIL\illex.fsl" exited with code 1. [C:\Users\charl\source\repos\fsharp\src\Co

mpiler\FSharp.Compiler.Service.fsproj::TargetFramework=netstandard2.0]

Hard to tell what's wrong, please run detailed build or collect the binlog, it should show whole error